Random UDP port open.

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Random UDP port open.

I ran a port scan on my machine, I fount that everything is how I like it - save for one UDP port that was open. And yet, according to lsof, nothing. The strange part is that each time I scan, it's always random, on a different port. (note: no nameserver running)

-a Displays all connections and listening ports.
-e Displays Ethernet statistics. This may be combined with the -s
option.
-n Displays addresses and port numbers in numerical form.
-o Displays the owning process ID associated with each connection.
-p proto Shows connections for the protocol specified by proto; proto
may be any of: TCP, UDP, TCPv6, or UDPv6. If used with the -s
option to display per-protocol statistics, proto may be any of:
IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, or UDPv6.
-r Displays the routing table.
-s Displays per-protocol statistics. By default, statistics are
shown for IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, and UDPv6;
the -p option may be used to specify a subset of the default.
interval Redisplays selected statistics, pausing interval seconds
between each display. Press CTRL+C to stop redisplaying
statistics. If omitted, netstat will print the current
configuration information once.

mine no have -u opps.

i have theory if you like hear. your isp may use those udp ports to slip their advertisements on to your computer.meow i set up a listener on some udp ports to see why they were open. i did get a connect with the isp sending advertisements. fwiw